Sharp error code
CHCover open or cartridge not detected
✅ You can try a fix
What it means
A side or front cover is open, or the toner / developer cartridge is not detected correctly.
Common causes
- Side or front cover not fully closed
- Cartridge not pushed fully in
- Cover switch or cartridge sensor fault
What you can safely try
- 1Remove the toner cartridge, shake it gently side to side and re-insert it until it clicks.
- 2Check the waste toner box — replace it if it is full.
- 3Use the toner made for your exact model; a wrong or refilled cartridge without a working chip often causes this code.
- 4Switch the machine off, wait 30 seconds and switch it on again — note whether the code comes back.
⚠️ If the code comes back after a restart, stop using the machine and call an engineer — running it on can damage more parts.
The exact meaning can vary slightly between models. Send us the model number for a precise diagnosis.